2.50 x .19 x 500 x 15.5 T- End
GR6686TAdditional Information
| Mainspring Height | 2.50 |
| Mainspring Thickness (Strength) | .19, 0.19 |
| Mainspring Length | 500 |
| Mainspring Barrel Diameter | 15.5 |
| Mainspring Type | T End |
| Longines Calibre Number | 18.68N, 18.69N, 18.69N2DC |
| Swiss Part Description | 1208, 20.100, 20.102, 20100, 20102, 770, 771, 7770, 7771, 7772, MainSpring, Mainsprings |